Effects of an alkali-acid purification process on the characteristics of eucalyptus lignin fractionated from a MIBK-based organosolv process
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Author list: Klamrassamee T., Tana T., Laosiripojana N., Moghaddam L., Zhang Z., Rencoret J., Gutierrez A., Del Rio J.C., Doherty W.O.S.
Publisher: Royal Society of Chemistry
Publication year: 2016
Journal: RSC Advances (2046-2069)
Volume number: 6
Issue number: 95
Start page: 92638
End page: 92647
Number of pages: 10
ISSN: 2046-2069
eISSN: 2046-2069
Languages: English-Great Britain (EN-GB)
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Abstract
In this study, the effects of an alkali-acid purification process on the properties of eucalyptus lignin isolated from a methyl isobutyl ketone (MIBK)/methanol/water-based organosolv fractionation process were evaluated. The results showed that the treatment reduced the content of carbohydrates, ash, nitrogen and sulfur, and improved lignin solubility (up to 218%) in five organic solvents (acetone, methanol, ethanol, tetrahydrofuran and dimethyl sulfoxide) and removed lignin fractions with smaller molecular weights. However, analysis by Py-GC/MS, solid state NMR and 2D-HSQC NMR indicated that the alkali-acid treatment process did not cause changes to the monomeric lignin subunits and linkages of the lignin polymer. The treated lignin showed slightly higher thermal stability at temperatures <250 ฐC, though its maximum rate of decomposition occurred at 325 ฐC, 26 ฐC lower than that of the untreated lignin. On the basis of these results, the significant improvement in solvent solubility of the lignin by the treatment process will widen lignin application. ฉ 2016 The Royal Society of Chemistry.
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